JPH0424899Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutting blade drive device in a reaping section of a harvester.

[Traditional technique]

Conventionally, a harvester is constructed by connecting a swinging link between the other end of a bell crank type crank lever whose one end engages with a transmission fork at the rear of the movable blade and the rear horizontal rotating shaft. In the reaping section, the swinging link is long, and both ends of the swinging link are connected to the rotating shaft side and the crank lever side through joint balls, respectively. If the length is shortened, the displacement angle in the plane between the swing link and the rotating shaft will increase and exceed the allowable angle of the joint ball, making connection using the joint ball impossible. The structure was such that it was not possible to shorten the length of the swing link.

[Problem that the invention attempts to solve]

The present invention shortens the length of the swing link to create a structure that allows reliable and good transmission, and shortens the space between the rotating shaft on the case side and the crank lever to make the mowing blade drive part of the reaping part a compact structure. By shortening the swing link, the link strength can be increased and the weight can be reduced, and twisting and vibration of the swing link can be reduced.
The joint ball can be used in a single piece to provide a structure that greatly improves the lifespan, and is provided so that it can be suitably implemented.

[Means for solving problems]

Therefore, in this invention, the rotating shaft is provided protruding from the transmission case located near the rear of the crank lever.
A support shaft parallel to the rotation shaft is protruded from the tip of the short crank arm fixed to the rotation shaft, and a connecting body that pivots on the support shaft has a support shaft extending perpendicular to the support shaft and in the axial direction of the support shaft. A connecting pin located on a distant side is installed, and the rear end of a short swing link whose front end side is connected to the other end side of the crank lever via a joint ball is rotatably fitted into the connecting pin. They are constructed by joining and connecting them.

[Effect]

With this configuration, the short swinging link can be smoothly and smoothly swung back and forth by the rotation of the rotary shaft, and the movable blade of the mower blade can be moved smoothly by reciprocating the crank lever via the joint ball. This means that it can be driven back and forth.

〔Example〕

Next, the embodiment shown in the drawings will be described. FIG. 2 shows a side view of a part of the combine, in which the threshing section B is mounted on the machine body supported by crawlers 12.
A reaping section A is installed in front of the reaping section A, and the reaping section A is provided with a lifting case 14 obliquely installed behind each of the frontmost grass dividing boards 13, and a movable blade is installed at the rear lower part of the lifting case 14. A movable blade 1 consisting of a movable blade 1a and a fixed blade 1b is installed horizontally, and a transmission fork 2 is installed extending from a part of the movable blade 1a supported by a knife holder 15 to the rear upper part.
The sprocket of the lower conveyance chain 17 and the pulley of the scraping belt 18 are respectively mounted on the upper part of the support shaft 16 erected behind the lower conveyance chain 17.
The structure is similar to the conventional structure, with an upper conveyor 19 installed on the upper side and a vertical conveyance chain 20 installed on the rear side.

Further, a transmission fork 2, which is a so-called knife head, is extended rearward and upper from a part of the movable blade 1a, and a center portion of a bell crank type crank lever 3 is rotatably fitted to the lower part of the support shaft 16. A roller 21 mounted on the shaft below one end 3a of the crank lever 3 is fitted into the transmission fork 2, and a cover mounting seat 23 having screw holes 22, 22 on the upper surface of the central part of the crank lever 3, respectively; 23 is formed and configured.

A horizontal rotating shaft 4 projects from the end of the transmission case 6 installed near the rear of the crank lever 3, and a square shaft 4a formed at the tip of the rotating shaft 4 is connected to one end of the short crank arm 7. The end of the support shaft 8 parallel to the rotating shaft 4 is fitted and fixed to the tip of the crank arm 7, and the connection has both parallel projecting pieces 9a and 9b. body 9
A bearing 25 is attached to the base of the support shaft 8 on the tip side thereof.
are interposed and are fitted freely to rotate, and both projecting pieces 9a, 9b
A connecting pin 10 that is orthogonal to the support shaft 8 and located laterally apart in the axial direction of the support shaft 8 is mounted between them, and the rear end portion 5b of the short swing link 5 is connected to the connection pin 10. A joint ball 11 is provided in the front end 5a of the swing link 5 and is connected to the lower end 3b of the crank lever 3.
are fitted together so as to rotate freely.

Reference numeral C denotes a cover, and the upper surface 26a is formed to cover the upper part of the crank lever 3 and the upper part of the front of the swing link 5 except for the one end 3a side. 23, and the front surface 26b is formed so that it can cover the other end 3b side of the crank lever 3 and the front of the front part of the swing link 5 on the side near the transmission fork 2,
The left side surface 26c is the other end 3 of the crank lever 3
b, and the lateral sides of the front part of the swing link 5 can be covered.

Therefore, during work, when the crank arm 7 rotates together with the rotating shaft 4 as shown by arrow A, the connecting body 9 rotates with respect to the support shaft 8 and the rear end of the swing link 5 rotates with respect to the connecting pin 10. 5b rotates, the swing link 5 swings back and forth as shown by arrow B, and at the same time, the crank lever 3 connected via the joint ball 11 is rotated back and forth. Then, one end 3a of the crank lever 3 reciprocates in the horizontal direction as shown by arrow C, and the engagement of the roller 21 and the transmission fork 2 causes the movable blade 1a to move horizontally as shown by arrow D. This means that reaping can be done by reciprocating.

In that case, the cover C rotates back and forth together with the crank bar 3, but since the cover C can always cover the joint between the crank lever 3 and the swing link 5 and its surroundings, the joint ball 11 This means that mud, water, dust, etc. scooped up by the cutting blade 1 can be prevented from entering or getting caught in the parts.

[Effect of idea]

In this way, the present invention connects the rear end of the short swing link 5 to the crank lever 3 via the joint ball 11, and connects the crank arm 7, support shaft 8, connecting body 9, and connecting pin 10 to the rotating shaft 4. Since they are interlocked and connected through the link, even if the swing link 5 is short, it can be smoothly swung back and forth in the front-back direction. can be made into a compact structure, the link strength can be increased by shortening the swing link 5, and the weight can be reduced. Also, twisting and vibration of the swing link 5 can be reduced, and the swing link 5 can be made compact in structure. The into ball 11 can be made into a single piece and has a structure that greatly improves the life span, and has the advantage of being suitable for implementation.

[Brief explanation of the drawing]

Figure 1 is a plan view of the main parts of an embodiment of the present invention;
Figure 2 is a side view of the front of the combine, Figure 3 is a side view of the main parts that are part of Figure 2, Figure 4 is its plan view, and Figure 5 is Figure 3 with the cover removed. FIG. 6 is a sectional view of a part of FIG. 1. 1a...Movable blade, 2...Transmission fork, 3...
Crank lever, 4... Rotating shaft, 5... Swinging link, 6... Transmission case, 7... Crank arm,
8... Support shaft, 9... Connecting body, 10... Connecting pin,
11... joint ball.

Claims (1)

[Scope of utility model registration request] A swing link 5 is connected between the other end of the bell crank type crank lever 3 whose one end engages with the transmission fork 2 at the rear of the movable blade 1a and the rear horizontal rotating shaft 4.
In the reaping section of the harvester, the rotary shaft 4 is provided protruding from a transmission case 6 disposed near the rear of the crank lever 3, and a short crank arm 7 fixed to the rotary shaft 4 is attached. A support shaft 8 protruding parallel to the rotating shaft 4 is provided at the tip, and a connecting body 9 that pivots on the support shaft 8 has a lateral side that is perpendicular to the support shaft 8 and spaced apart in the axial direction of the support shaft 8. A connecting pin 10 located at is installed, and the front end side is connected to the crank lever 3.
A cutting blade drive device characterized in that the rear end of a short swing link 5 connected to the other end side via a joint ball 11 is rotatably fitted and connected to the connecting pin 10.